Feat(ToolsScreen and ToolStarScreen): Show skeleton when loading tool

app/src/main/kotlin/top/fatweb/oxygen/toolbox/ui/component/ToolCard.kt

@@ -1,5 +1,8 @@
 package top.fatweb.oxygen.toolbox.ui.component
 
+import androidx.compose.animation.core.LinearEasing
+import androidx.compose.animation.core.RepeatMode
+import androidx.compose.animation.core.infiniteRepeatable
 import androidx.compose.foundation.ExperimentalFoundationApi
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
@@ -15,6 +18,7 @@ import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
@@ -30,6 +34,11 @@ import androidx.compose.ui.graphics.vector.ImageVector
 import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.unit.dp
+import com.valentinilk.shimmer.LocalShimmerTheme
+import com.valentinilk.shimmer.ShimmerBounds
+import com.valentinilk.shimmer.rememberShimmer
+import com.valentinilk.shimmer.shimmer
+import com.valentinilk.shimmer.shimmerSpec
 import top.fatweb.oxygen.toolbox.R
 import top.fatweb.oxygen.toolbox.icon.OxygenIcons
 import top.fatweb.oxygen.toolbox.model.tool.ToolEntity
@@ -244,3 +253,131 @@ private fun AuthorInfo(
         )
     }
 }
+
+@Composable
+fun ToolCardSkeleton(
+    modifier: Modifier = Modifier
+) {
+    val shimmer = rememberShimmer(
+        shimmerBounds = ShimmerBounds.Window,
+        theme = LocalShimmerTheme.current.copy(
+            animationSpec = infiniteRepeatable(
+                animation = shimmerSpec(
+                    durationMillis = 1_500,
+                    easing = LinearEasing,
+                    delayMillis = 200
+                ),
+                repeatMode = RepeatMode.Restart
+            )
+        )
+    )
+
+    Card(
+        modifier = modifier
+            .clip(RoundedCornerShape(8.dp)),
+        shape = RoundedCornerShape(8.dp),
+        colors = CardDefaults.cardColors(containerColor = MaterialTheme.colorScheme.surface)
+    ) {
+        Column(
+            modifier = Modifier.padding(16.dp)
+        ) {
+            Row(
+                modifier = Modifier
+                    .height(28.dp)
+            ) {
+                Surface(
+                    modifier = modifier
+                        .fillMaxHeight()
+                        .width(64.dp)
+                        .shimmer(shimmer),
+                    shape = RoundedCornerShape(8.dp),
+                    color = MaterialTheme.colorScheme.surfaceContainer
+                ) {}
+            }
+            Spacer(Modifier.height(16.dp))
+            Box(
+                modifier = Modifier
+                    .fillMaxWidth(),
+                contentAlignment = Alignment.Center
+            ) {
+                Surface(
+                    modifier = Modifier
+                        .size(80.dp)
+                        .shimmer(shimmer),
+                    shape = RoundedCornerShape(8.dp),
+                    color = MaterialTheme.colorScheme.surfaceContainer
+                ) {}
+            }
+            Spacer(Modifier.height(16.dp))
+            Column(
+                modifier = modifier.fillMaxWidth(),
+                horizontalAlignment = Alignment.CenterHorizontally,
+                verticalArrangement = Arrangement.spacedBy(6.dp)
+            ) {
+                Surface(
+                    modifier = Modifier
+                        .size(width = 40.dp, height = 22.dp)
+                        .shimmer(shimmer),
+                    shape = RoundedCornerShape(4.dp),
+                    color = MaterialTheme.colorScheme.surfaceContainer
+                ) {}
+                Surface(
+                    modifier = Modifier
+                        .size(width = 60.dp, height = 20.dp)
+                        .shimmer(shimmer),
+                    shape = RoundedCornerShape(4.dp),
+                    color = MaterialTheme.colorScheme.surfaceContainer
+                ) {}
+                Column(
+                    verticalArrangement = Arrangement.spacedBy(2.dp)
+                ) {
+                    Surface(
+                        modifier = Modifier
+                            .size(width = 120.dp, height = 12.dp)
+                            .shimmer(shimmer),
+                        shape = RoundedCornerShape(4.dp),
+                        color = MaterialTheme.colorScheme.surfaceContainer
+                    ) {}
+                    Surface(
+                        modifier = Modifier
+                            .size(width = 120.dp, height = 12.dp)
+                            .shimmer(shimmer),
+                        shape = RoundedCornerShape(4.dp),
+                        color = MaterialTheme.colorScheme.surfaceContainer
+                    ) {}
+                    Surface(
+                        modifier = Modifier
+                            .size(width = 80.dp, height = 12.dp)
+                            .shimmer(shimmer),
+                        shape = RoundedCornerShape(4.dp),
+                        color = MaterialTheme.colorScheme.surfaceContainer
+                    ) {}
+                }
+            }
+            Spacer(Modifier.height(16.dp))
+            Row(
+                modifier = Modifier
+                    .fillMaxWidth(),
+                verticalAlignment = Alignment.CenterVertically,
+                horizontalArrangement = Arrangement.spacedBy(8.dp, Alignment.CenterHorizontally)
+            ) {
+                Surface(
+                    modifier = Modifier
+                        .size(24.dp)
+                        .shimmer(shimmer),
+                    shape = RoundedCornerShape(12.dp),
+                    color = MaterialTheme.colorScheme.surfaceContainer
+                ) {}
+                Surface(
+                    modifier = Modifier
+                        .size(width = 120.dp, height = 12.dp)
+                        .shimmer(shimmer),
+                    shape = RoundedCornerShape(4.dp),
+                    color = MaterialTheme.colorScheme.surfaceContainer
+                ) {}
+            }
+        }
+    }
+}
+
+const val DEFAULT_TOOL_CARD_SKELETON_COUNT = 8

app/src/main/kotlin/top/fatweb/oxygen/toolbox/ui/star/ToolStarScreen.kt

@@ -43,11 +43,13 @@ import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import top.fatweb.oxygen.toolbox.R
 import top.fatweb.oxygen.toolbox.icon.OxygenIcons
 import top.fatweb.oxygen.toolbox.model.tool.ToolEntity
+import top.fatweb.oxygen.toolbox.ui.component.DEFAULT_TOOL_CARD_SKELETON_COUNT
 import top.fatweb.oxygen.toolbox.ui.component.DialogClickerRow
 import top.fatweb.oxygen.toolbox.ui.component.DialogSectionGroup
 import top.fatweb.oxygen.toolbox.ui.component.DialogTitle
 import top.fatweb.oxygen.toolbox.ui.component.Indicator
 import top.fatweb.oxygen.toolbox.ui.component.ToolCard
+import top.fatweb.oxygen.toolbox.ui.component.ToolCardSkeleton
 import top.fatweb.oxygen.toolbox.ui.component.scrollbar.DraggableScrollbar
 import top.fatweb.oxygen.toolbox.ui.component.scrollbar.rememberDraggableScroller
 import top.fatweb.oxygen.toolbox.ui.component.scrollbar.scrollbarState
@@ -96,6 +98,24 @@ internal fun StarScreen(
         when (starScreenUiState) {
             StarScreenUiState.Loading -> {
                 Indicator()
+                LazyVerticalStaggeredGrid(
+                    modifier = Modifier
+                        .fillMaxSize(),
+                    columns = StaggeredGridCells.Adaptive(160.dp),
+                    contentPadding = PaddingValues(16.dp),
+                    horizontalArrangement = Arrangement.spacedBy(16.dp),
+                    verticalItemSpacing = 24.dp,
+                    state = state
+                ) {
+                    items(count = DEFAULT_TOOL_CARD_SKELETON_COUNT) {
+                        ToolCardSkeleton()
+                    }
+
+                    item(span = StaggeredGridItemSpan.FullLine) {
+                        Spacer(Modifier.height(8.dp))
+                        Spacer(Modifier.windowInsetsBottomHeight(WindowInsets.safeDrawing))
+                    }
+                }
             }
 
             StarScreenUiState.Nothing -> {
@@ -210,6 +230,7 @@ private fun ToolMenu(
 @Composable
 private fun howManyTools(starScreenUiState: StarScreenUiState) =
     when (starScreenUiState) {
-        StarScreenUiState.Loading, StarScreenUiState.Nothing -> 0
+        StarScreenUiState.Loading -> DEFAULT_TOOL_CARD_SKELETON_COUNT
+        StarScreenUiState.Nothing -> 0
         is StarScreenUiState.Success -> starScreenUiState.tools.size
     }

app/src/main/kotlin/top/fatweb/oxygen/toolbox/ui/tools/ToolsScreen.kt

@@ -47,11 +47,13 @@ import kotlinx.coroutines.launch
 import top.fatweb.oxygen.toolbox.R
 import top.fatweb.oxygen.toolbox.icon.OxygenIcons
 import top.fatweb.oxygen.toolbox.model.tool.ToolEntity
+import top.fatweb.oxygen.toolbox.ui.component.DEFAULT_TOOL_CARD_SKELETON_COUNT
 import top.fatweb.oxygen.toolbox.ui.component.DialogClickerRow
 import top.fatweb.oxygen.toolbox.ui.component.DialogSectionGroup
 import top.fatweb.oxygen.toolbox.ui.component.DialogTitle
 import top.fatweb.oxygen.toolbox.ui.component.Indicator
 import top.fatweb.oxygen.toolbox.ui.component.ToolCard
+import top.fatweb.oxygen.toolbox.ui.component.ToolCardSkeleton
 import top.fatweb.oxygen.toolbox.ui.component.scrollbar.DraggableScrollbar
 import top.fatweb.oxygen.toolbox.ui.component.scrollbar.rememberDraggableScroller
 import top.fatweb.oxygen.toolbox.ui.component.scrollbar.scrollbarState
@@ -116,6 +118,24 @@ internal fun ToolsScreen(
         when (toolsScreenUiState) {
             ToolsScreenUiState.Loading -> {
                 Indicator()
+                LazyVerticalStaggeredGrid(
+                    modifier = Modifier
+                        .fillMaxSize(),
+                    columns = StaggeredGridCells.Adaptive(160.dp),
+                    contentPadding = PaddingValues(16.dp),
+                    horizontalArrangement = Arrangement.spacedBy(16.dp),
+                    verticalItemSpacing = 24.dp,
+                    state = state
+                ) {
+                    items(count = DEFAULT_TOOL_CARD_SKELETON_COUNT) {
+                        ToolCardSkeleton()
+                    }
+
+                    item(span = StaggeredGridItemSpan.FullLine) {
+                        Spacer(Modifier.height(8.dp))
+                        Spacer(Modifier.windowInsetsBottomHeight(WindowInsets.safeDrawing))
+                    }
+                }
             }
 
             ToolsScreenUiState.Nothing -> {
@@ -254,6 +274,7 @@ private fun ToolMenu(
 @Composable
 private fun howManyTools(toolsScreenUiState: ToolsScreenUiState) =
     when (toolsScreenUiState) {
-        ToolsScreenUiState.Loading, ToolsScreenUiState.Nothing -> 0
+        ToolsScreenUiState.Loading -> DEFAULT_TOOL_CARD_SKELETON_COUNT
+        ToolsScreenUiState.Nothing -> 0
         is ToolsScreenUiState.Success -> toolsScreenUiState.tools.size
     }